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/* Copyright (C) 2000 Thomas Petazzoni
Copyright (C) 2004 David Decotigny
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#ifndef _SOS_KMEM_VMM_H_
#define _SOS_KMEM_VMM_H_
/**
* @file kmem_vmm.h
*
* Kernel Memory Allocator for multiple-page-sized objects residing in
* the kernel (virtual memory) space. Relies on the slab cache
* allocator to allocate its (internal) "range" data structure.
*/
#include <hwcore/paging.h>
/* The base and top virtual addresses covered by the kernel allocator */
#define SOS_KMEM_VMM_BASE 0x4000 /* 16kB */
#define SOS_KMEM_VMM_TOP SOS_PAGING_MIRROR_VADDR /* 1GB - 4MB */
/** Opaque structure used internally and declared here for physmem.h */
struct sos_kmem_range;
#include <sos/kmem_slab.h>
/**
* Mark the areas belonging to SOS_KMEM_VMM_BASE and SOS_KMEM_VMM_TOP
* are either used or free. Those that are already mapped are marked
* as "used", and the 0..SOS_KMEM_VMM_BASE virtual addresses as marked
* as "used" too (to detect incorrect pointer dereferences).
*/
sos_ret_t
sos_kmem_vmm_subsystem_setup(sos_vaddr_t kernel_core_base_vaddr,
sos_vaddr_t kernel_core_top_vaddr,
sos_vaddr_t bootstrap_stack_bottom_vaddr,
sos_vaddr_t bootstrap_stack_top_vaddr);
/*
* Flags for kmem_vmm_new_range and kmem_vmm_alloc
*/
/** Physical pages should be immediately mapped */
#define SOS_KMEM_VMM_MAP (1<<0)
/** Allocation should either success or fail, without blocking */
#define SOS_KMEM_VMM_ATOMIC (1<<1)
/**
* Allocate a new kernel area spanning one or multiple pages.
*
* @param range_base_vaddr If not NULL, the start address of the range
* is stored in this location
* @eturn a new range structure
*/
struct sos_kmem_range *sos_kmem_vmm_new_range(sos_size_t nb_pages,
sos_ui32_t flags,
sos_vaddr_t *range_base_vaddr);
sos_ret_t sos_kmem_vmm_del_range(struct sos_kmem_range *range);
/**
* Straighforward variant of sos_kmem_vmm_new_range() returning the
* range's start address instead of the range structure
*/
sos_vaddr_t sos_kmem_vmm_alloc(sos_size_t nb_pages,
sos_ui32_t flags);
/**
* @note you are perfectly allowed to give the address of the
* kernel image, or the address of the bios area here, it will work:
* the kernel/bios WILL be "deallocated". But if you really want to do
* this, well..., do expect some "surprises" ;)
*/
sos_ret_t sos_kmem_vmm_free(sos_vaddr_t vaddr);
/**
* @return TRUE when vaddr is covered by any (used) kernel range
*/
sos_bool_t sos_kmem_vmm_is_valid_vaddr(sos_vaddr_t vaddr);
/* *****************************
* Reserved to kmem_slab.c ONLY.
*/
/**
* Associate the range with the given slab.
*/
sos_ret_t sos_kmem_vmm_set_slab(struct sos_kmem_range *range,
struct sos_kslab *slab);
/**
* Retrieve the (used) slab associated with the range covering vaddr.
*
* @return NULL if the range is not associated with a KMEM range
*/
struct sos_kslab *sos_kmem_vmm_resolve_slab(sos_vaddr_t vaddr);
#endif /* _SOS_KMEM_VMM_H_ */
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